add assertion for dist_url #157
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Summary: All workers must use the same dist_url / init_method, currently we call
dist_url = f"file:///tmp/mcvdh_dist_file_{uid}_{time.time()}"to created a shareddist_url, but this only works for single machine, add an assertion.Reviewed By: acisseJZhong
Differential Revision: D46339835